Bell & Gossett 118708 – Coupler
B&G part number 118708 is a 3/4″x5/8″ spring coupler used on Bell & Gossett PD35 & 37 booster pumps. The breaking of the pump coupling (coupler) indicates the motor mounts have lost their resiliency – The motor shaft and pump shaft are now out of alignment. Always replace the motor mounts once your pump coupling breaks – And keep an extra pump coupler in the boiler room. They always seem to break on the coldest day in January!
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